Advantech SOM-A2558 ADDR20, ADDR22, Bufrdy, DATA15, DATA14, DATA13, DATA12, DATA11, DATA10, DATA9

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User’s Manual for Advantech SOM-A2558 series module V1.00

			to the output enables of memory
			devices to control data bus drivers.
B7	ADDR20	O	SoC PXA255 system address 20					No pulling
			Memory write enable. Connect to the
A7	nBUF_WE	O	write					No pulling
			enables of memory devices.
B8	ADDR22	O	SoC PXA255 system address 22					No pulling
	BUF_RD_nW		Read/Write		for	static	interface.
A8		O	Signals that the current transaction					No pulling
	R
			is a read or write.
B9	GND	P	Ground					-
			Variable Latency			I/O	Ready pin.	Pull high
			Notifies the memory controller when
A9	BUF_RDY	I						with
			an external bus device is ready to
								100Kohm
			transfer data.
B10	DATA15	IO	SoC PXA255 system data 15					No pulling
A10	DATA14	IO	SoC PXA255 system data 14					No pulling
B11	DATA13	IO	SoC PXA255 system data 13					No pulling
A11	DATA12	IO	SoC PXA255 system data 12					No pulling
B12	DATA11	IO	SoC PXA255 system data 11					No pulling
A12	DATA10	IO	SoC PXA255 system data 10					No pulling
B13	DATA9	IO	SoC PXA255 system data 9					No pulling
A13	DATA8	IO	SoC PXA255 system data 8					No pulling
B14	DATA31	IO	SoC PXA255 system data 31					No pulling
A14	DATA30	IO	SoC PXA255 system data 30					No pulling
B15	DATA29	IO	SoC PXA255 system data 29					No pulling
A15	DATA28	IO	SoC PXA255 system data 28					No pulling
B16	DATA27	IO	SoC PXA255 system data 27					No pulling
A16	DATA26	IO	SoC PXA255 system data 26					No pulling
B17	DATA25	IO	SoC PXA255 system data 25					No pulling
A17	DATA24	IO	SoC PXA255 system data 24					No pulling
	nBUF_SDRA		SDRAM RAS. Connect to the row
B18		O	address strobe (RAS) pins for all					No pulling
	S
			banks of SDRAM.
			SDRAM CS for bank 0. Connect to
A18	nBUF_SDCS	O	the chip select (CS) pin for SDRAM.					No pulling
	0		For	the	PXA255		processor
			nBUF_SDCS0 can be Hi-Z.
			SDRAM DQM for data byte 0.
B19	BUF_DQM0	O	Connect to the data output mask					No pulling
			enables (DQM) for SDRAM.
			SDRAM DQM for data byte 2.
A19	BUF_DQM2	O	Connect to the data output mask					No pulling
			enables (DQM) for SDRAM.
			SDRAM DQM for data byte 3.
B20	BUF_DQM3	O	Connect to the data output mask					No pulling
			enables (DQM) for SDRAM.
A20	nBUF_PWAIT	I	PCMCIA wait. (input) Driven low by					Pull high
			the	PCMCIA	card to		extend the	with

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